If you wanna stick with Peavey, look into an Ultra Plus. Leagues better than a Valveking, and I prefer it to the 5150 and 6505 in all aspects. Amazing tones on all 3 channels and incredible built-in reverb.

The valve king can work OK just about everything, but not perfect for anything. But don't let people tell you that certain amps can't play certain kinds of music. You'll have to play with the knobs and find your sound.

Honestly, last year bought the Ibanaez Tube Screamer Amp Head, and everyone told me that it wouldn't work for black metal, but I was patient and learned how to dial in the sound I wanted. I wouldn't trade that amp for the world.